- A new family of bis-DCM based dopants for red OLEDs
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We have synthesized a series of novel bis-DCM derivatives as candidate red dopants for use in organic light-emitting devices (OLEDs), by introducing various donor-substituted aryl rings. Compared to DCJTB (621 nm), the novel dopants (637-677 nm) showed more red-shifted emission in 1,2-dichloroethane. Using bis-DCMNEtOBu (7) as a dopant, we fabricated OLEDs with the configuration of ITO/4,4′,4″-tris(3-methylphenylammo)triphenylamine (m-MTDATA) (20 nm)/N,N′-bis(1-naphthyl)-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB) (40 nm)/tris(8-quinolinolato)aluminium (Alq3) : red dopant (35 nm, x wt%)/Alq3 (35 nm) LiF/Al. The device with a doping concentration of 1.25 wt% showed pure red emission at λmax = 654 nm (chromaticity coordinate: x = 0.67, y = 0.33) and a maximum brightness of 2500 cd m-2. The chromaticity coordinates were almost independent of current density. Moreover, highly efficient red emission (x = 0.63, y = 0.36) was obtained in the 0.74 wt% doped device. The maximum external quantum efficiency was 4.46% at 7 V, the current efficiency was 3.43 cd A-1, and the power efficiency was 1.64 Im W-1. The highest brightness of 8300 cd m-2 was obtained at 19.6 V. The Royal Society of Chemistry 2005.
- Jung, Byung-Jun,Lee, Jeong-Ik,Chu, Hye Yong,Do, Lee-Mi,Lee, Jaemin,Shim, Hong-Ku
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p. 2470 - 2475
(2007/10/03)
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- Red organic electroluminescent compounds, method for synthesizing the same and electroluminescent devices
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Red organic electroluminescent compounds containing bis-condensed DCM derivatives, a method for synthesizing the same and an organic electroluminescent device using the same. The red organic electroluminescent compound having the formula: wherein R1, R1', R2 and R2' are independently hydrogen atom, or C1-C30 alkyl, aryl or hetero ring; R3, R3', R4 and R4' are independently hydrogen atom, C1-C10 alkyl or alkoxy; one or more pairs selected from the group consisting of R1 and R3, R1' and R3', R2 and R4, and R2' and R4' can be connected in forms of -R1-R3-, -R1'-R3'-, -R2-R4-, and -R2'-R4'-; R5, R5', R6 and R6' are independently hydrogen atom, or C1-C30 alkyl, alkoxy or aryl; at least one of R3, R3', R4, R4', R5, R5', R6 and R6' is not hydrogen atom.
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